9.6 Adjust concentration measurement with Trim
Offset
Trim Offset adjusts the meter's concentration measurement to match a reference value.
Tip
You can adjust concentration measurement by applying the trim offset only, or by applying both the
trim offset and the trim slope. For most applications, the trim offset is sufficient.
Prerequisites
You must be able to take a sample of your process fluid and obtain a laboratory
concentration value at line density and line temperature.
Procedure
1. Take a concentration reading from the meter, and record line density and line
temperature.
2. Take a sample of the process fluid and obtain a laboratory value for concentration at
line density and line temperature, in the units used by the meter.
3. Subtract the meter value from the laboratory value.
4. Enter the result as the trim offset.
• Using the display: Not available
• Using ProLink III: Device Tools > Configuration > Process Measurement > Concentration
Measurement
• Using the Field Communicator: Configure > Manual Setup > Measurements > Optional
Setup > Concentration Measurement > Trim CM Process Variables > Concentration Offset
5. Take another concentration reading from the meter, and compare it to the
laboratory value.
• If the two values are acceptably close, the trim is complete.
• If the two values are not acceptably close, repeat this procedure.
Example: Calculating the trim offset
Laboratory value 64.21 °Brix
Meter value 64.93 °Brix
64.21 − 64.93 = −0.72
Concentration offset: −0.72
Related information
Adjust concentration measurement with Trim Offset and Trim Slope
Measurement support
126 Micro Motion
®
Fork Density Meters (FDM)
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